Method for preparing trimanganese tetroxide

Abstract

The invention discloses a method for preparing trimanganese tetroxide. Manganese carbonate is used as a raw material, added with a carbon source, placed in sealed microwave equipment, then heated to 650-750 DEG C with a heating rate of 8-20 DEG C / min, and sintered for 0.5-2 h; and the product is ground by a wet grinding after tapping, so as to obtain trimanganese tetroxide. According to the present invention, rapid and comprehensive heating of the microwave equipment and ''non-thermal effect'' enable carbon dioxide generated from decomposition of manganese carbonate to timely react with manganese oxide at a low temperature, so as to produce trimanganese tetroxide; and the method has the advantages of simple process, easy control process, low energy consumption, complete reaction process and stable specific surface area.

Description

technical field [0001] The invention relates to the technical field of inorganic non-metallic materials, in particular to a preparation method of trimanganese tetraoxide. Background technique [0002] Trimanganese tetraoxide is one of the important raw materials for the preparation of soft magnetic materials such as manganese zinc ferrite. Since soft magnetic materials are widely used in the electronics industry, the preparation of high-quality trimanganese tetraoxide has been approved by the National Development and Planning Commission It is listed as a current high-tech industrialization project by the Ministry of Science and Technology, and is a high-tech product encouraged by the state to optimize its development. [0003] At present, the methods for preparing trimanganese tetraoxide in the prior art generally include the following types. [0004] 1. Reduction method: under the preparation method of trimanganese tetraoxide introduced in US Patent No. 4411878, the oxides...

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Problems solved by technology

[0005] 2. Oxidation method: as the publication number CN 101177304A, the publication date is a Chinese invention patent on May 14, 2008. This patent uses manganese carbonate as a raw material at 120- At 800°C, manganese carbonate is thermally oxidized and decomposed into a mixture of manganese dioxide, manganese monoxide and manganese carbonate with air or oxygen, and then the mixture of manganese is roasted at 800-1200°C to produce trimanganese tetraoxide; The method is divided into two steps, the energy consumption is high, it is difficult to avoid the occurrence of sintering phenomenon, and the specific surface area and activity of the product are low

[0007]The maximum temperature of this method is controlled at 1100°C, which requires strict atmosphere and complex operation, which is not easy to realize in practical industrialization

[0008] 3. Wet method: such as the Chinese invention patent with publication number CN 101948138A, whose disclosure date is January 19, 2011. This patent belongs to hydrometallurgy. The substance adjusts the pH value of manganese sulfate to easily convert the manganese sulfate into manganese hydroxide; add ionic liquid, and carry out microwave-assisted heating under the state of being exposed to air, and oxidize manganese hydroxide to trimanganese tetraoxide, and filter , after washing and drying, a brown-red manganese tetraoxide solid is obtained. This method has low energy consumption and low production cost, but the process is too complicated and the specific surface area is not stable.

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